The engine cooling sensor on a 1999 Mazda Millenia with a 2.5L engine is typically located near the thermostat housing, often on the cylinder head or engine block. It is usually positioned to monitor the coolant temperature as it exits the engine. To access it, you may need to remove any components obstructing the area, such as the air intake or engine cover. Always consult the vehicle's service manual for the exact location and removal procedures.
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